I'm trying to get working multiple screens, and discovered that Resolume only output one test card to the Composition.
It could be great that we have "per slice" test card like in the introduction video:

I've always had my doubts about providing this as an automated function in Resolume.

As He2neg mentions, the actual purpose of these test cards is to make sure that the input map you've used to prepare your content and composition, actually matches the output map used in the LED processor.

The moment we start generating this output based on the current output position and size of your slices, the test card will always show that it's correct, even though your input can still be completely off. At that point, it looks cool, but it serves no real purpose.

Now we could provide it as an automated test card on the input side, but that would mean you'd have to stop layer to slice routing and the world is just not ready for that yet...

I've always had my doubts about providing this as an automated function in Resolume.

As He2neg mentions, the actual purpose of these test cards is to make sure that the input map you've used to prepare your content and composition, actually matches the output map used in the LED processor.

The moment we start generating this output based on the current output position and size of your slices, the test card will always show that it's correct, even though your input can still be completely off. At that point, it looks cool, but it serves no real purpose.

Now we could provide it as an automated test card on the input side, but that would mean you'd have to stop layer to slice routing and the world is just not ready for that yet...